"It was like this sharp little pain, then I kind of sat up really quick and saw it was a shark," Kai said. The boy said he shook his left foot, which left the 2- to 3-foot shark "squirming around on the board" for a few seconds.

Kai, his brothers and his dad, Bryce Rittgers, had been surfing off the coast of a park at the south end of this Central Florida barrier island town, but Kai was the only one left in the water at the time, considered a risk factor for a shark attack. Slightly scared by the encounter, Kai paddled toward shore as fast as he could.

The incident is at least the fifth reported shark bite off Brevard County beaches this year compared to two in 2011. Last year 75 unprovoked attacks were reported worldwide, including 11 in Florida, according to the International Shark Attack File maintained at the Florida Museum of Natural History. None of the 29 U.S. attacks last year was fatal.

Rittgers took his son to see a friend, Dawn Jockovich, who is an emergency room doctor.

She put a few bandages over the crescent-shaped line of teeth marks on Kai's heel - no stitches were necessary - and issued a prescription for an antibiotic.

Recovering at home Monday night, the middle school student said he felt good, and that he wouldn't go surfing that late in the day again.

His father agreed.

"I tell him every time it gets late, it's feeding time, you need to come in," Rittgers said.